Paris as seen with full visual fields

Paris as seen with bitemporal hemianopsia

Bitemporal hemianopsia is the medical description of a type of partial blindness that is associated with lesions of the optic chiasm, the area where the optic nerves from the right and left eyes cross near the pituitary gland. The International Statistical Classification of Diseases and Related Health Problems (commonly known by the abbreviation ICD) provides codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances and external causes of injury or disease. ... The following codes are used with International Statistical Classification of Diseases and Related Health Problems. ... // H00-H59 - Diseases of the eye and adnexa (H00-H06) Disorders of eyelid, lacrimal system and orbit (H00) Hordeolum and chalazion (H000) Hordeolum and other deep inflammation of eyelid (H001) Chalazion (H01) Other inflammation of eyelid (H010) Blepharitis (H011) Noninfectious dermatoses of eyelid (H02) Other disorders of eyelid (H020) Entropion... The International Statistical Classification of Diseases and Related Health Problems (commonly known by the abbreviation ICD) provides codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances and external causes of injury or disease. ... The following is a list of codes for International Statistical Classification of Diseases and Related Health Problems. ... Image File history File links Download high resolution version (1183x595, 1238 KB) Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... Image File history File links Download high resolution version (1183x595, 1238 KB) Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... Image File history File links Download high resolution version (1183x595, 703 KB) Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... Image File history File links Download high resolution version (1183x595, 703 KB) Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... Blindness is the condition of lacking visual perception due to physiological or psychological factors. ... Visual pathway with optic chiasm circled The optic chiasm (from the Greek χλαζειν to mark with an X, after the letter Χ chi) is the part of the brain where the optic nerves partially cross, those parts of the right eye which see things on the right side being connected to the... Located at the base of the skull, the pituitary gland is protected by a bony structure called the sella turcica. ...

The absence of vision in half of a visual field is described as hemianopsia. This article or section does not cite its references or sources. ... The term visual field is sometimes used as a synonym to field of view, though they do not designate the same thing. ... Hemianopsia is the loss of half the vision in both eyes. ...

The visual field of each eye can be divided in two vertically, with the outer half being described as temporal, and the inner half being described as nasal.

In bitemporal hemianopsia vision is missing in the outer half of both the right and left visual fields. The temporal visual field information falls on nasal retina and the nasal visual field falls on temporal retina. The nasal retina is responsible for carrying the information from the temporal visual field, and it goes on to cross to the other side of the brain at the optic chiasm. When there is compression at optic chiasm the visual impulse from both nasal retina are affected, so it leads to inability to view the temporal, or peripheral, vision. This phenomenon is known as bitemporal hemianopsia. Knowing the physiology of visual signal flow is very important in understandng bitemporal hemianopsia. Visual pathway with optic chiasm circled The optic chiasm (from the Greek χλαζειν to mark with an X, after the letter Χ chi) is the part of the brain where the optic nerves partially cross, those parts of the right eye which see things on the right side being connected to the... Visual pathway with optic chiasm circled The optic chiasm (from the Greek χλαζειν to mark with an X, after the letter Χ chi) is the part of the brain where the optic nerves partially cross, those parts of the right eye which see things on the right side being connected to the...

Bitemporal hemianopsia most commonly occurs as a result of tumors located at the mid-optic chiasm. Since the adjacent structure is the Pituitary gland, some common tumors causing compression are Pituitary adenomas, and Craniopharyngiomas. Pituitary adenomas are tumors that occur in the pituitary gland, and account for about 10% of intracranial neoplasms. ... Craniopharyngioma is a type of tumor that comprises 9% of all pediatric brain tumors and usually occur in children between 5 and 10 years of age. ...

Etymology

Bitemporal hemianopsia can be broken down as follows:

• bi-: involves both left and right visual fields
• temporal: involves the temporal visual field
• hemi-: involves half of each visual field
• anopsia: blindness

See also

• Binasal hemianopsia

Binasal hemianopsia is the medical description of a type of partial blindness that is associated with certain lesions of the eye, and of the central nervous system, such as congenital hydrocephlus. ...

External links

• Case report of Bilateral Hemianopsia Due to Pituitary Adenoma. Clinical Cases and Images.
• GP Notebook